Kevin is completely right. Green + green= black and blue. Ultimately your relationship with your horse will suffer because you won't know how to ask him for what you want and he won't know how to give it to you. It is so easy to ruin a horse.
I also just got my first horse who is my very own and have a trainer helping me learn to ride and work with him. My horse is a 20 year old schoolmaster TB. There is nothing I love more than being able to just hop on him and learning new things from him, because he demands that I ride properly or he won't comply. When I get on a less well trained horse it is glaringly obvious that I could never survive a greenie at this point in my riding.
It is awesome that you have this new baby, but will be more awesome for both of you if you send him off to a trainer and then find a very experienced rider to lease him until you are ready for him. Even a free lease would be better than letting him sit, because you're going to want to keep all that expensive training on him.